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Code Issues Releases Activity

avformat/segment: add option min_seg_duration

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New option can be used to avoid creating very short segments with inputs
whose GOP size is variable or unharmonic with segment_time.

Only effective with segment_time.
This commit is contained in:
Gyan Doshi 2022-12-21 19:41:58 +05:30
parent aee0f320ac
commit d39b34123d
2 changed files with 19 additions and 1 deletions
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5
doc/muxers.texi
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@ -2369,6 +2369,11 @@ Note that splitting may not be accurate, unless you force the
reference stream key-frames at the given time. See the introductory
notice and the examples below.
@item min_seg_duration @var{time}
Set minimum segment duration to @var{time}, the value must be a duration
specification. This prevents the muxer ending segments at a duration below
this value. Only effective with @code{segment_time}. Default value is "0".
@item segment_atclocktime @var{1|0}
If set to "1" split at regular clock time intervals starting from 00:00
o'clock. The @var{time} value specified in @option{segment_time} is

15
libavformat/segment.c
View File

@ -93,6 +93,7 @@ typedef struct SegmentContext {
int list_type; ///< set the list type
AVIOContext *list_pb; ///< list file put-byte context
int64_t time; ///< segment duration
int64_t min_seg_duration; ///< minimum segment duration
int use_strftime; ///< flag to expand filename with strftime
int increment_tc; ///< flag to increment timecode if found
@ -696,6 +697,9 @@ static int seg_init(AVFormatContext *s)
return AVERROR(EINVAL);
}
if (seg->times_str || seg->frames_str)
seg->min_seg_duration = 0;
if (seg->times_str) {
if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)
return ret;
@ -710,6 +714,10 @@ static int seg_init(AVFormatContext *s)
}
seg->clocktime_offset = seg->time - (seg->clocktime_offset % seg->time);
}
if (seg->min_seg_duration > seg->time) {
av_log(s, AV_LOG_ERROR, "min_seg_duration cannot be greater than segment_time\n");
return AVERROR(EINVAL);
}
}
if (seg->list) {
@ -839,7 +847,7 @@ static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
{
SegmentContext *seg = s->priv_data;
AVStream *st = s->streams[pkt->stream_index];
int64_t end_pts = INT64_MAX, offset;
int64_t end_pts = INT64_MAX, offset, pkt_pts_avtb;
int start_frame = INT_MAX;
int ret;
struct tm ti;
@ -890,11 +898,15 @@ calc_times:
pkt->flags & AV_PKT_FLAG_KEY,
pkt->stream_index == seg->reference_stream_index ? seg->frame_count : -1);
if (pkt->pts != AV_NOPTS_VALUE)
pkt_pts_avtb = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q);
if (pkt->stream_index == seg->reference_stream_index &&
(pkt->flags & AV_PKT_FLAG_KEY || seg->break_non_keyframes) &&
(seg->segment_frame_count > 0 || seg->write_empty) &&
(seg->cut_pending || seg->frame_count >= start_frame ||
(pkt->pts != AV_NOPTS_VALUE &&
pkt_pts_avtb - seg->cur_entry.start_pts >= seg->min_seg_duration &&
av_compare_ts(pkt->pts, st->time_base,
end_pts - seg->time_delta, AV_TIME_BASE_Q) >= 0))) {
/* sanitize end time in case last packet didn't have a defined duration */
@ -1031,6 +1043,7 @@ static const AVOption options[] = {
{ "segment_clocktime_wrap_duration", "set segment clocktime wrapping duration", OFFSET(clocktime_wrap_duration), AV_OPT_TYPE_DURATION, {.i64 = INT64_MAX}, 0, INT64_MAX, E},
{ "segment_time", "set segment duration", OFFSET(time),AV_OPT_TYPE_DURATION, {.i64 = 2000000}, INT64_MIN, INT64_MAX, E },
{ "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, E },
{ "min_seg_duration", "set minimum segment duration", OFFSET(min_seg_duration), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, E },
{ "segment_times", "set segment split time points", OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
{ "segment_frames", "set segment split frame numbers", OFFSET(frames_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
{ "segment_wrap", "set number after which the index wraps", OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },